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ceph: improve readahead for file holes

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When readahead encounters file holes, osd reply returns error -ENOENT,
finish_read() skips adding pages to the the page cache. So readahead
does not work for file holes. The fix is adding zero pages to the
page cache when -ENOENT is returned.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2015-09-07 15:46:24 +08:00 committed by Ilya Dryomov
parent 55b0b31cbc
commit 438386853d
1 changed files with 1 additions and 1 deletions
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2
fs/ceph/addr.c
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@ -276,7 +276,7 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
for (i = 0; i < num_pages; i++) {
struct page *page = osd_data->pages[i];
if (rc < 0)
if (rc < 0 && rc != ENOENT)
goto unlock;
if (bytes < (int)PAGE_CACHE_SIZE) {
/* zero (remainder of) page */